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/*
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $ISC: gethost.c,v 1.29 2001/07/10 18:25:41 gson Exp $ */
#include <config.h>
#include <errno.h>
#include <string.h>
#include <lwres/net.h>
#include <lwres/netdb.h>
#include "assert_p.h"
#define LWRES_ALIGNBYTES (sizeof(char *) - 1)
#define LWRES_ALIGN(p) \
(((unsigned long)(p) + LWRES_ALIGNBYTES) &~ LWRES_ALIGNBYTES)
static struct hostent *he = NULL;
static int copytobuf(struct hostent *, struct hostent *, char *, int);
struct hostent *
lwres_gethostbyname(const char *name) {
if (he != NULL)
lwres_freehostent(he);
he = lwres_getipnodebyname(name, AF_INET, 0, &lwres_h_errno);
return (he);
}
struct hostent *
lwres_gethostbyname2(const char *name, int af) {
if (he != NULL)
lwres_freehostent(he);
he = lwres_getipnodebyname(name, af, 0, &lwres_h_errno);
return (he);
}
struct hostent *
lwres_gethostbyaddr(const char *addr, int len, int type) {
if (he != NULL)
lwres_freehostent(he);
he = lwres_getipnodebyaddr(addr, len, type, &lwres_h_errno);
return (he);
}
struct hostent *
lwres_gethostent(void) {
if (he != NULL)
lwres_freehostent(he);
return (NULL);
}
void
lwres_sethostent(int stayopen) {
/*
* Empty.
*/
UNUSED(stayopen);
}
void
lwres_endhostent(void) {
/*
* Empty.
*/
}
struct hostent *
lwres_gethostbyname_r(const char *name, struct hostent *resbuf,
char *buf, int buflen, int *error)
{
struct hostent *he;
int res;
he = lwres_getipnodebyname(name, AF_INET, 0, error);
if (he == NULL)
return (NULL);
res = copytobuf(he, resbuf, buf, buflen);
lwres_freehostent(he);
if (res != 0) {
errno = ERANGE;
return (NULL);
}
return (resbuf);
}
struct hostent *
lwres_gethostbyaddr_r(const char *addr, int len, int type,
struct hostent *resbuf, char *buf, int buflen,
int *error)
{
struct hostent *he;
int res;
he = lwres_getipnodebyaddr(addr, len, type, error);
if (he == NULL)
return (NULL);
res = copytobuf(he, resbuf, buf, buflen);
lwres_freehostent(he);
if (res != 0) {
errno = ERANGE;
return (NULL);
}
return (resbuf);
}
struct hostent *
lwres_gethostent_r(struct hostent *resbuf, char *buf, int buflen, int *error) {
UNUSED(resbuf);
UNUSED(buf);
UNUSED(buflen);
*error = 0;
return (NULL);
}
void
lwres_sethostent_r(int stayopen) {
/*
* Empty.
*/
UNUSED(stayopen);
}
void
lwres_endhostent_r(void) {
/*
* Empty.
*/
}
static int
copytobuf(struct hostent *he, struct hostent *hptr, char *buf, int buflen) {
char *cp;
char **ptr;
int i, n;
int nptr, len;
/*
* Find out the amount of space required to store the answer.
*/
nptr = 2; /* NULL ptrs */
len = (char *)LWRES_ALIGN(buf) - buf;
for (i = 0; he->h_addr_list[i]; i++, nptr++) {
len += he->h_length;
}
for (i = 0; he->h_aliases[i]; i++, nptr++) {
len += strlen(he->h_aliases[i]) + 1;
}
len += strlen(he->h_name) + 1;
len += nptr * sizeof(char*);
if (len > buflen) {
return (-1);
}
/*
* Copy address size and type.
*/
hptr->h_addrtype = he->h_addrtype;
n = hptr->h_length = he->h_length;
ptr = (char **)LWRES_ALIGN(buf);
cp = (char *)LWRES_ALIGN(buf) + nptr * sizeof(char *);
/*
* Copy address list.
*/
hptr->h_addr_list = ptr;
for (i = 0; he->h_addr_list[i]; i++, ptr++) {
memcpy(cp, he->h_addr_list[i], n);
hptr->h_addr_list[i] = cp;
cp += n;
}
hptr->h_addr_list[i] = NULL;
ptr++;
/*
* Copy official name.
*/
n = (buf + buflen) - cp;
{
int r;
r = strlcpy(cp, he->h_name, n);
if ( r < n )
n = r;
}
hptr->h_name = cp;
cp += n;
/*
* Copy aliases.
*/
hptr->h_aliases = ptr;
for (i = 0; he->h_aliases[i]; i++) {
n = (buf + buflen) - cp;
{
int r;
r = strlcpy(cp, he->h_aliases[i], n);
if ( r < n )
n = r;
}
hptr->h_aliases[i] = cp;
cp += n;
}
hptr->h_aliases[i] = NULL;
return (0);
}
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